Observation of the $J/\psi$ and $\psi (3686)$ decays into $\eta {\Sigma }^{+}{\bar{\Sigma }}^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +572

The decays $J/\psi \to \eta {\Sigma }^{+}\bar{\Sigma }{}^{-}$ and $\psi (3686)\to \eta {\Sigma }^{+}\bar{\Sigma }{}^{-}$ are observed for the first time, using $(10087\pm 44)\times 10^6$ $J/\psi$ and $(448.1\pm 2.9)\times 10^6$ $ψ(…